how to fix P0174 code on my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, and a flashlight.
• Sub-steps:
  1. Use a vacuum gauge to check for leaks in the intake system.
  2. Visually inspect all vacuum hoses and gaskets for cracks or disconnections.
  3. Replace any damaged hoses or gaskets found during inspection.

3. Check and Replace Fuel Filter (if necessary)

• Tools Required: Fuel line disconnect tool, socket set, and rags.
• Sub-steps:
  1. Relieve fuel system pressure by removing the fuel pump relay and starting the engine until it stalls.
  2. Disconnect the fuel lines from the filter using the fuel line disconnect tool.
  3. Remove the old fuel filter and install the new one, ensuring proper orientation.
  4. Reconnect the fuel lines and reinstall the fuel pump relay.

4. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner or isopropyl alcohol, soft cloth or brush.
• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the intake.
  3. Clean the sensor element with MAF cleaner, being careful not to damage it.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

5. Inspect and Test Oxygen Sensors

• Tools Required: Multimeter, socket set.
• Sub-steps:
  1. Inspect the wiring harness and connectors for damage or corrosion.
  2. Use a multimeter to test the voltage output of the oxygen sensors.
  3. Replace any faulty oxygen sensors as needed.